DME toasted ??

LudoN54

Specialist
Mar 9, 2020
53
13
0
these codes poped from nowhere
both lambda show 25 AFR
i'm FBO+ meth
both 02 sensors have a few miles on them ( not even 2000 miles )
harness looks ok
 

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NoQuarter

Major
Nov 24, 2017
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Indiana, USA
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Z4 35is, 535xi, X5 35i
I am curious to understand how your concerns went straight to a toasted DME from this information?

Dial it back a notch. This seems like something much less serious.
 

LudoN54

Specialist
Mar 9, 2020
53
13
0
I am curious to understand how your concerns went straight to a toasted DME from this information?

Dial it back a notch. This seems like something much less serious.

i don't know, sensors are supposed to be fine
harness looks fine
02 and harness are connected to DME so...
 

NoQuarter

Major
Nov 24, 2017
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Indiana, USA
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Got it.

Remember, some codes are just symptoms of a different problem and don't indicate a massive failure.

Start with the fuel error. The others are just O2.

Are you logging? See what your fuel pressures look like.
 

LudoN54

Specialist
Mar 9, 2020
53
13
0
Got it.

Remember, some codes are just symptoms of a different problem and don't indicate a massive failure.

Start with the fuel error. The others are just O2.

Are you logging? See what your fuel pressures look like.
I'm not worried about the fuel error as i saw everywhere that this code is common on N54 and should be ignored, my whole fuel system is brand new and act perfectly

the thing that worried me is about the 02 sensors, because i usually have agressive tune, and getting too lean ( or even too rich) don't sound like a good plans+ car is damn slow with these false reading
 

NoQuarter

Major
Nov 24, 2017
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Indiana, USA
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Z4 35is, 535xi, X5 35i
Right... that is the low pressure sensor code.

So this Is still happening or do the codes stay away after clearing?

What is your Meth mix? You are certain it is spraying the correct volume?
 

LudoN54

Specialist
Mar 9, 2020
53
13
0
Right... that is the low pressure sensor code.

So this Is still happening or do the codes stay away after clearing?

What is your Meth mix? You are certain it is spraying the correct volume?

it still happening after i clear the code, and even without meth
i'm running 100% meth, 6X625 ml
 

LudoN54

Specialist
Mar 9, 2020
53
13
0
Right... that is the low pressure sensor code.

So this Is still happening or do the codes stay away after clearing?

What is your Meth mix? You are certain it is spraying the correct volume?

before, i was running charpipe injection (3500ML)
and when i switched to Port Injection 6X625 ( so that's 3750ML) and then...issue
 
Last edited:

GreyNBlueE92

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Oct 3, 2018
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Turn the ignition on and check fuel pressure. It should be around 70 on the low side. You say your fuel system is brand new, maybe something came undone. Maybe a line burst in the tank. If there's no fuel pressure, pull the top hat and go from there
 

LudoN54

Specialist
Mar 9, 2020
53
13
0
My question is how. I've went through many sensors and plug/unplugged, and never had one blow. Am curious.
I currently have the 2DED code, which is close circuit violation...i guess it’s related may have an issue on a line and that’s why it’s happening
Also, it happened straight when i used meth port injection